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orbit 1" sprinkler valve won't turn off....help...

I am about to toss in the towel! I have a 1" orbit sprinkler valve that will not turn off. Have taken it apart, put in a new diaphragm, new solenoid, and a new cap. Tested the electrical connection for power. But, once I turn on the water, the valve stays open. When I move the manual bypass lever to on, continues to run. As I rotate it to closed, I do get "clunking" in the line, seems the valve is trying to shut off, but then the water stays on. If I unscrew the solenoid a bit (1/4 turn) the flow slows, but does not stop. I have cycled the system, but the valve still does not turn off. I am afraid that I may have to dig up the box and replace the entire assembly. Really don't want to do that.

My system is from secondary water, I have a pump to up the pressure when engaged. But, when I turn off the water to the entire system, then turn it on again, I still have the open valve.... The other two valves in the box (both the same type), both work correctly.